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Warning: reset() expects parameter 1 to be array, null given in commerce_cart_add_to_cart_form()
We've added a new attribute field to commerce product entity and got warning "reset() expects parameter 1 to be array, null given in commerce_cart_add_to_cart_form()" on the other products which doesn't have value in that field.
Solution:
The solution was very easy. We've just added a new product type, cloned all fields with Bundle clone and switched product types of new products using Bundle Switcher.